Typescript: Bad function signature for .sample().

[vlinder]

Summary

TypeScript typings for most does not support sending only one stream as an argument to sample(). (But most supports this.)

I also suggest we move to using mapped types instead, supporting arbitrary number of arguments for functions where supported by TypeScript.

I have made a PR implementing a simple change without mapped types to support this use case, #536.

Expected result

Not getting a type error

Actual Result

Getting a type error

Versions

• Typescript 3.8.3
• most.js: 1.8.0

Steps to reproduce

1. Paste the code to reproduce into editor.
2. See the error appear, expecting a second stream.

Code to reproduce

import { just } from "most";
just().sample((x) => x, just())